Cohousing-L Mailing List: Re: SIPs (was Re: Here's my Vision. Has anyone ever thought of )

[Racheli Gai (racheli]

On Jan 19, 2008, at 2:46 PM, Philip Proefrock wrote:
> There are two kinds of formaldehyde glues; one (urea formaldehyde) 
> which
> is used in many furniture and other interior applications, and will 
> offgas
> formaldehyde for decades.  The other (phenol formaldehyde) which is 
> used
> when the materials may be exposed to the weather, does not have any
> offgassing because the formaldehyde is molecularly locked into the
> compound.
> The glues used on most OSB (oriented strand board, the material used 
> for
> the exterior faces of the panels) are the latter type, which does not
> offgas.
According to my understanding, phenol formaldehyde DOES offgass, but 
most
of the offgassing happens in the first few months, and the amount of 
offgasing
after that is small, especially compared to urea formaldehyde.

Racheli.